If you check out the linked study, it doesn’t do such debunking. It found no association between hangover severity and vasopressin and it wasn’t clear what other markers of dehydration it measured. Note that measuring dehydration accurately could be difficult and different people might experience different levels of dehydration differently.
It should be the default assumption that there are many mechanisms involved in hangover, because the effects of ethanol are very complex.
If you check out the linked study, it doesn’t do such debunking. It found no association between hangover severity and vasopressin and it wasn’t clear what other markers of dehydration it measured. Note that measuring dehydration accurately could be difficult and different people might experience different levels of dehydration differently.
It should be the default assumption that there are many mechanisms involved in hangover, because the effects of ethanol are very complex.